cmd/asm: add arm64 instructions VUMAX and VUMIN

This CL adds support for arm64 fp&simd instructions VUMAX and VUMIN.
Fixes #42326

Change-Id: I3757ba165dc31ce1ce70f3b06a9e5b94c14d2ab9
Reviewed-on: https://go-review.googlesource.com/c/go/+/271497


Trust: eric fang <eric.fang@arm.com>
Run-TryBot: eric fang <eric.fang@arm.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: fannie zhang <Fannie.Zhang@arm.com>
Reviewed-by: eric fang <eric.fang@arm.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>